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A Large Area LaBr3/NaI Phoswich for Hard X-ray Astronomy
Hong Li, Jianfeng Ji, Hua Feng +2
In terms of energy resolution, temporal response to burst events, and thermal stability, lanthanum bromide doped with Ce is a much better choice than the traditional NaI(Tl) scinti…
Ultraluminous X-ray Sources in the Chandra and XMM-Newton Era
Hua Feng, Roberto Soria
Ultraluminous X-ray sources (ULXs) are accreting black holes that may contain the missing population of intermediate mass black holes or reflect super-Eddington accretion physics.…
Optical emission of the ultraluminous X-ray source NGC 5408 X-1: donor star or irradiated accretion disk?
Fabien Grisé, Philip Kaaret, Stéphane Corbel +3
We obtained 3 epochs of simultaneous Hubble Space Telescope (HST)/Wide Field Camera 3 and Chandra observations of the ultraluminous X-ray source NGC 5408 X-1. The counterpart of th…
Compact Optical Counterparts of Ultraluminous X-ray Sources
Lian Tao, Hua Feng, Fabien Grise +1
Using archival Hubble Space Telescope (HST) imaging data, we report the multiband photometric properties of 13 ultraluminous X-ray sources (ULXs) that have a unique compact optical…
The Optical Counterpart of NGC 1313 X-1
Lin Yang, Hua Feng, Philip Kaaret
We identify the optical counterpart of the ultraluminous X-ray source (ULX) NGC 1313 X-1 and discuss constraints on its physical nature from multiband optical spectra. There is a s…
XMM-Newton Observations of NGC 247: X-ray Population and a Supersoft Ultraluminous X-ray Source
Jing Jin, Hua Feng, Philip Kaaret +1
We report on a new XMM-Newton observation of NGC 247 from December 2009. The galaxy contains a supersoft, ultraluminous X-ray source (ULX) whose spectrum consists of a thermal comp…